[PATCH] USB dummy_hcd: Partial OTG emulation
Partial OTG support for dummy_hcd, mostly as a framework for further work.
It emulates the new OTG flags in the host and peripheral frameworks, if
that option is configured. But it's incomplete:
- Resetting the peripheral needs to clear the OTG state bits;
a second enumeration won't work correctly.
- This stops modeling HNP right when roles should switch the first time.
It should probably disconnect, then set the usb_bus.is_b_host and
usb_gadget.is_a_peripheral flags; then it'd enumerate almost normally,
except for the role reversal. Roles could then switch a second time,
back to "normal" (with those flags cleared).
- SRP should be modeled as "resume from port-unpowered", which is
a state that usbcore doesn't yet use.
HNP can be triggered by enabling the OTG whitelist and configuring a
gadget driver that's not in that list; or by configuring Gadget Zero
to identify itself as the HNP test device.
Sent-by: David Brownell <[EMAIL PROTECTED]>
Signed-off-by: Alan Stern <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
commit 5742b0c95026c817d9c266174ca39a909e8d38ca
tree 4f94fd2d99c134e9d600983b834014b933fca7c6
parent 65111084c63d7674dc37833e8eb59cfdaa4d0bda
author Alan Stern <[EMAIL PROTECTED]> Mon, 02 May 2005 11:25:17 -0400
committer Greg Kroah-Hartman <[EMAIL PROTECTED]> Mon, 27 Jun 2005 14:43:51 -0700
drivers/usb/gadget/dummy_hcd.c | 30 ++++++++++++++++++++++++++++--
1 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -601,8 +601,10 @@ static int dummy_wakeup (struct usb_gadg
struct dummy *dum;
dum = gadget_to_dummy (_gadget);
- if ((dum->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) == 0
- || !(dum->port_status & (1 << USB_PORT_FEAT_SUSPEND)))
+ if (!(dum->port_status & (1 << USB_PORT_FEAT_SUSPEND))
+ || !(dum->devstatus &
+ ( (1 << USB_DEVICE_B_HNP_ENABLE)
+ | (1 << USB_DEVICE_REMOTE_WAKEUP))))
return -EINVAL;
/* hub notices our request, issues downstream resume, etc */
@@ -713,6 +715,9 @@ usb_gadget_register_driver (struct usb_g
dum->gadget.ops = &dummy_ops;
dum->gadget.is_dualspeed = 1;
+ /* maybe claim OTG support, though we won't complete HNP */
+ dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
+
dum->devstatus = 0;
dum->resuming = 0;
@@ -1215,6 +1220,16 @@ restart:
switch (setup.wValue) {
case USB_DEVICE_REMOTE_WAKEUP:
break;
+ case USB_DEVICE_B_HNP_ENABLE:
+ dum->gadget.b_hnp_enable = 1;
+ break;
+ case USB_DEVICE_A_HNP_SUPPORT:
+ dum->gadget.a_hnp_support = 1;
+ break;
+ case USB_DEVICE_A_ALT_HNP_SUPPORT:
+ dum->gadget.a_alt_hnp_support
+ = 1;
+ break;
default:
value = -EOPNOTSUPP;
}
@@ -1533,6 +1548,13 @@ static int dummy_hub_control (
spin_unlock (&dum->lock);
dum->driver->suspend (&dum->gadget);
spin_lock (&dum->lock);
+ /* HNP would happen here; for now we
+ * assume b_bus_req is always true.
+ */
+ if (((1 << USB_DEVICE_B_HNP_ENABLE)
+ & dum->devstatus) != 0)
+ dev_dbg (dummy_dev(dum),
+ "no HNP yet!\n");
}
}
break;
@@ -1648,6 +1670,10 @@ static int dummy_start (struct usb_hcd *
hcd->power_budget = 8;
hcd->state = HC_STATE_RUNNING;
+#ifdef CONFIG_USB_OTG
+ hcd->self.otg_port = 1;
+#endif
+
/* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
device_create_file (dummy_dev(dum), &dev_attr_urbs);
return 0;
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